- No date has been set for the 74-year-old leader's return and he has not been seen in any official pictures during his absence.
- Buhari himself admitted on his return to Abuja in March that he had not been that ill before.
Nigeria's Vice President Yemi Osinbajo, the acting head of government, was in London on Tuesday to meet with President Muhammadu Buhari, who has been receiving unspecified medical treatment there since May 7.
No date has been set for the 74-year-old leader's return and he has not been seen in any official pictures during his absence, and questions about his condition are met with silence.
"AgP (Acting President) Osinbajo meeting with President Buhari in London today," the vice president's spokesman, Laolu Akande, wrote on Twitter.
No further details were given, though Akande said the vice president was expected back in Abuja "afterwards".
Buhari's prolonged absence comes as the country, Africa's most populous, is facing a bruising economic recession that has seen inflation spike and investments stall.
The government has denied that the president is terminally ill or even dead, but for many Nigerians the incident has cast doubt on Buhari's pledges for greater government openness and accountability.